Sansui Au-7900 cuts out then comes on again

[vic]

thank you for all your help but how does it happen when I cleaned ports amp started turning on as normal? and still running after 1 hour now?

 

[spark1]

ok will do in the meantime this is what I found when sound lost I tapped the amp sound came back on and now 1 hour still on so thinking a solder joint or loose connection somewhere?

Sounds like a good possibility. Does this problem happen regardless of source selected?

Also, when you were using your electronics cleaning spray, did you use it on the connected/separated switch as well? What product are you using?

 

[vic]

Sounds like a good possibility. Does this problem happen regardless of source selected?

Also, when you were using your electronics cleaning spray, did you use it on the connected/separated switch as well? What product are you using?

using SCA electrical contact and parts cleaner yes cleaned the separated switch and I just did a quick clean. Been on for 2 hours now no problem

 

[pete_mac]

using SCA electrical contact and parts cleaner yes cleaned the separated switch and I just did a quick clean. Been on for 2 hours now no problem

Whilst the SCA cleaner will 'clean' the switches, it has no residual lubrication properties. This is a bad thing for switches in my opinion. With this kind of cleaner, you need to follow it up with a suitable lubricant/protectant. You'd be better off buying a can of Servisol clean and lube from Jaycar - it has never let me down. https://www.jaycar.com.au/contact-cleaner-lubricant-spray-can/p/NA1012 Alternatively, Caig Deoxit D5 also leaves a slight protective residue.

 

[vic]

been on 3 hours now and working as it should so maybe clean before u try anything else makes sense ?

 

[spark1]

Well, it doesn't hurt (if done right). The symptoms you described were not what I would have thought were as a result of dirty/oxidized switches or pots, and the fact that it started working after tapping on it suggests to me that you do have a bad connection or solder joint. Hopefully it will not act up again, as tracking it down may be difficult.

 

[nosirrah]

You can lead a horse to water, but you cant make it drink.....

 

[vic]

You can lead a horse to water, but you cant make it drink.....

you can climb in the roof and check wiring or 1st change a light bulb see if that's the problem

 

[spark1]

you can climb in the roof and check wiring or 1st change a light bulb see if that's the problem

Uhhh....I am under the impression that cleaning didn't fix it. So maybe the correct first step when having a problem is to whack it.

 

[vic]

yes you would be surprised how well ur kids will behave when they get a whack,